Schafer, who walked twice and scored two runs Sunday and is hitting .391 this spring, braced himself with his left hand while making a tumbling catch in shallow center field.
"I just came in and dove for the ball and felt something pop when I landed, and I went to go have it X-rayed, and the X-rays look good," Schafer said.
Schafer will likely be out for at least a few games, manager Brad Mills said. Schafer wasn't scheduled to play Monday against the Marlins in Jupiter, Fla., and Mills said he would likely hold him out Tuesday considering the Astros are off Wednesday.
Schafer had left wrist surgery at the end of the 2009 season, and last year broke a joint on his left middle finger. He was on the disabled list with that injury when the Astros acquired him from the Braves last July as part of the Michael Bourn deal.
"I've had a lot of problems with that hand," Schafer said. "I feel good right now, and an injury is the last thing I want, obviously. Hopefully, it will be OK.